.page-about {
  --about-max: 1180px;
  --about-pad: 1.25rem;
  --about-ink: #1a1a1a;
  --about-muted: #8c8c8c;
  --about-primary: #0a2540;
  --about-soft: #3d5a80;
  --about-accent: #c6ff00;
  --about-alt: #00e676;
  --about-paper: #f5efe6;
  --about-white: #ffffff;
  --about-line: 3px;
  --about-shadow: 8px 8px 0 rgba(10, 37, 64, 0.15);
  background: var(--about-paper);
  color: var(--about-ink);
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  line-height: 1.7;
  overflow-x: hidden;
}

.page-about .about-wrap {
  max-width: var(--about-max);
  margin-inline: auto;
  padding-inline: var(--about-pad);
  width: 100%;
}

.page-about .about-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  max-width: var(--about-max);
  margin-inline: auto;
  padding: 1.25rem var(--about-pad) 0;
  font-size: 0.85rem;
  color: var(--about-muted);
}

.page-about .about-breadcrumb a {
  color: var(--about-primary);
  font-weight: 600;
  text-decoration: none;
  transition: color 0.2s ease;
}

.page-about .about-breadcrumb a:hover {
  color: var(--about-alt);
  text-decoration: underline;
}

.page-about .about-breadcrumb span[aria-current="page"] {
  color: var(--about-ink);
  font-weight: 600;
}

/* ===== 01 品牌宣言 ===== */
.page-about .about-manifesto {
  position: relative;
  padding: 4rem 0 5rem;
  border-bottom: var(--about-line) solid var(--about-primary);
}

.page-about .about-manifesto-grid {
  display: grid;
  gap: 2rem;
  position: relative;
}

.page-about .about-kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--about-primary);
  text-transform: uppercase;
  margin: 0 0 1.25rem;
}

.page-about .about-kicker::before {
  content: "";
  width: 2.5rem;
  height: var(--about-line);
  background: var(--about-accent);
}

.page-about .about-manifesto h1 {
  font-family: "Noto Serif SC", "Songti SC", "SimSun", serif;
  font-size: clamp(2rem, 5vw, 4rem);
  font-weight: 800;
  line-height: 1.18;
  color: var(--about-primary);
  margin: 0 0 1.4rem;
  max-width: 12em;
  text-wrap: balance;
}

.page-about .about-lede {
  font-size: clamp(1rem, 1.4vw, 1.18rem);
  line-height: 1.8;
  color: var(--about-primary);
  border-left: 4px solid var(--about-accent);
  padding-left: 1rem;
  margin: 0;
  max-width: 30em;
}

.page-about .about-manifesto-body p {
  font-size: 0.95rem;
  color: var(--about-ink);
  margin: 0 0 1rem;
  max-width: 52em;
}

.page-about .about-quote {
  font-family: "Noto Serif SC", "Songti SC", "SimSun", serif;
  font-size: clamp(1.3rem, 2.6vw, 1.9rem);
  font-weight: 700;
  line-height: 1.4;
  color: var(--about-primary);
  background: var(--about-white);
  border: var(--about-line) solid var(--about-ink);
  box-shadow: var(--about-shadow);
  padding: 1.6rem 1.8rem;
  margin: 1.8rem 0;
  position: relative;
}

.page-about .about-quote span {
  display: block;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--about-alt);
  line-height: 1;
}

.page-about .about-quote span:last-child {
  text-align: right;
}

.page-about .about-toc {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.25rem 1rem;
  border-top: var(--about-line) solid var(--about-primary);
  border-bottom: var(--about-line) solid var(--about-primary);
  padding: 0.75rem 0;
  margin-top: 0.5rem;
}

.page-about .about-toc-label {
  font-family: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--about-muted);
  text-transform: uppercase;
}

.page-about .about-toc a {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--about-primary);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.page-about .about-toc a:hover {
  color: var(--about-alt);
  border-bottom-color: var(--about-accent);
}

.page-about .about-manifesto-num {
  position: absolute;
  right: 0.25rem;
  top: 0;
  text-align: right;
  opacity: 0.25;
  pointer-events: none;
  z-index: 0;
}

.page-about .about-big-num {
  font-family: "Noto Serif SC", "Songti SC", "SimSun", serif;
  font-size: clamp(6rem, 16vw, 12rem);
  font-weight: 800;
  line-height: 0.85;
  color: var(--about-primary);
  display: block;
}

.page-about .about-manifesto-num p {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--about-primary);
  margin: 0.5rem 0 0;
  text-transform: uppercase;
}

/* ===== 02 发展历程 ===== */
.page-about .about-journey {
  background: var(--about-white);
  border-bottom: var(--about-line) solid var(--about-primary);
  padding: 4rem 0 5rem;
}

.page-about .about-section-head {
  display: flex;
  align-items: flex-start;
  gap: 0.9rem;
  margin-bottom: 2rem;
}

.page-about .about-section-head .section-number {
  font-family: "Noto Serif SC", "Songti SC", "SimSun", serif;
  font-size: clamp(2.4rem, 4vw, 3.4rem);
  font-weight: 800;
  line-height: 1;
  color: var(--about-primary);
  background: var(--about-accent);
  border: var(--about-line) solid var(--about-primary);
  padding: 0.35rem 0.7rem 0.3rem;
  display: inline-block;
  flex-shrink: 0;
  transform: translateY(-0.1em);
}

.page-about .about-section-head h2 {
  font-family: "Noto Serif SC", "Songti SC", "SimSun", serif;
  font-size: clamp(1.5rem, 3vw, 2.4rem);
  font-weight: 700;
  line-height: 1.2;
  color: var(--about-ink);
  margin: 0;
}

.page-about .about-section-head p {
  font-size: 0.9rem;
  color: var(--about-muted);
  margin: 0.35rem 0 0;
}

.page-about .about-journey-main {
  display: grid;
  gap: 2rem;
  margin-bottom: 3rem;
}

.page-about .about-journey-figure {
  margin: 0;
  background: var(--about-primary);
  border: var(--about-line) solid var(--about-primary);
  box-shadow: var(--about-shadow);
  position: relative;
}

.page-about .about-journey-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 16 / 10;
}

.page-about .about-journey-figure figcaption {
  position: absolute;
  right: 0.75rem;
  bottom: 0.75rem;
  background: var(--about-accent);
  color: var(--about-primary);
  font-family: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.35rem 0.6rem;
  border: 2px solid var(--about-primary);
}

.page-about .about-journey-aside {
  border: var(--about-line) solid var(--about-primary);
  background: var(--about-paper);
  padding: 1.5rem;
  align-self: start;
}

.page-about .about-journey-aside h3 {
  font-family: "Noto Serif SC", "Songti SC", "SimSun", serif;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--about-primary);
  margin: 0 0 0.75rem;
}

.page-about .about-journey-aside > p {
  font-size: 0.9rem;
  color: var(--about-ink);
  margin: 0 0 1rem;
}

.page-about .about-journey-facts {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0;
  margin: 0;
  border-top: 2px solid var(--about-primary);
  border-left: 2px solid var(--about-primary);
}

.page-about .about-journey-facts div {
  padding: 0.75rem;
  border-right: 2px solid var(--about-primary);
  border-bottom: 2px solid var(--about-primary);
}

.page-about .about-journey-facts dt {
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--about-muted);
  text-transform: uppercase;
}

.page-about .about-journey-facts dd {
  margin: 0.25rem 0 0;
  font-family: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--about-primary);
}

/* 时间线 */
.page-about .about-timeline {
  display: grid;
  gap: 1rem;
  margin-top: 2.5rem;
  position: relative;
  padding-top: 1.75rem;
  border-top: var(--about-line) dashed var(--about-accent);
}

.page-about .about-timeline-item {
  position: relative;
  background: var(--about-white);
  border: var(--about-line) solid var(--about-primary);
  padding: 1.4rem;
  box-shadow: 4px 4px 0 rgba(10, 37, 64, 0.12);
}

.page-about .about-timeline-item::before {
  content: "";
  position: absolute;
  top: -1.4rem;
  left: 1.25rem;
  width: 1.75rem;
  height: 0.75rem;
  background: var(--about-accent);
  border: 2px solid var(--about-primary);
}

.page-about .about-timeline-year {
  display: inline-block;
  font-family: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--about-primary);
  background: var(--about-accent);
  border: 2px solid var(--about-primary);
  padding: 0.2rem 0.5rem;
  margin-bottom: 0.75rem;
}

.page-about .about-timeline-item h3 {
  font-family: "Noto Serif SC", "Songti SC", "SimSun", serif;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--about-ink);
  margin: 0 0 0.4rem;
}

.page-about .about-timeline-item p {
  font-size: 0.87rem;
  color: var(--about-ink);
  margin: 0;
}

/* ===== 03 服务理念 ===== */
.page-about .about-service {
  padding: 4rem 0 5rem;
  border-bottom: var(--about-line) solid var(--about-primary);
}

.page-about .about-service-grid {
  display: grid;
  gap: 1.25rem;
  align-items: start;
}

.page-about .about-service-card {
  background: var(--about-white);
  border: var(--about-line) solid var(--about-primary);
  padding: 1.6rem;
  box-shadow: var(--about-shadow);
  position: relative;
}

.page-about .about-service-index {
  font-family: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--about-primary);
  border: 2px solid var(--about-primary);
  background: var(--about-accent);
  display: inline-block;
  padding: 0.15rem 0.4rem;
  margin-bottom: 0.75rem;
}

.page-about .about-service-card h3 {
  font-family: "Noto Serif SC", "Songti SC", "SimSun", serif;
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--about-primary);
  margin: 0 0 0.6rem;
}

.page-about .about-service-card p {
  font-size: 0.9rem;
  color: var(--about-ink);
  margin: 0;
}

.page-about .about-service-card--accent {
  background: var(--about-primary);
  border-color: var(--about-primary);
}

.page-about .about-service-card--accent h3,
.page-about .about-service-card--accent p {
  color: var(--about-white);
}

.page-about .about-service-card--accent .about-service-index {
  color: var(--about-white);
  border-color: var(--about-white);
  background: transparent;
}

.page-about .about-service-figure {
  margin: 0;
  border: var(--about-line) solid var(--about-primary);
  box-shadow: var(--about-shadow);
  background: var(--about-primary);
}

.page-about .about-service-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 3 / 2;
}

/* ===== 04 本地化承诺 ===== */
.page-about .about-local {
  background: var(--about-white);
  border-bottom: var(--about-line) solid var(--about-primary);
  padding: 4rem 0 5rem;
}

.page-about .about-local-grid {
  display: grid;
  gap: 2rem;
  align-items: center;
}

.page-about .about-local-copy .about-section-head {
  margin-bottom: 1.5rem;
}

.page-about .about-local-lead {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--about-ink);
  margin: 0 0 1.4rem;
  max-width: 38em;
}

.page-about .about-local-list {
  list-style: none;
  margin: 0 0 1.8rem;
  padding: 0;
  display: grid;
  gap: 0.8rem;
}

.page-about .about-local-list li {
  position: relative;
  padding-left: 1.75rem;
  font-size: 0.92rem;
  color: var(--about-ink);
}

.page-about .about-local-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 0.85rem;
  height: 0.85rem;
  background: var(--about-accent);
  border: 2px solid var(--about-primary);
}

.page-about .about-local-panel {
  position: relative;
  background: var(--about-primary);
  background-image:
    linear-gradient(rgba(198, 255, 0, 0.12) 1px, transparent 1px),
    linear-gradient(90deg, rgba(198, 255, 0, 0.12) 1px, transparent 1px);
  background-size: 22px 22px;
  border: var(--about-line) solid var(--about-primary);
  box-shadow: var(--about-shadow);
  color: var(--about-white);
  padding: 3rem 1.8rem 2rem;
  overflow: hidden;
  min-height: 320px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
}

.page-about .about-local-mark {
  position: absolute;
  top: 0;
  right: 0.5rem;
  font-family: "Noto Serif SC", "Songti SC", "SimSun", serif;
  font-size: clamp(8rem, 18vw, 13rem);
  font-weight: 800;
  line-height: 0.8;
  color: var(--about-accent);
  opacity: 0.9;
  pointer-events: none;
}

.page-about .about-local-label {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--about-accent);
  margin: 0 0 0.4rem;
  position: relative;
}

.page-about .about-local-place {
  font-family: "Noto Serif SC", "Songti SC", "SimSun", serif;
  font-size: 2.2rem;
  font-weight: 800;
  line-height: 1.25;
  margin: 0 0 1rem;
  color: var(--about-white);
}

.page-about .about-local-desc {
  font-size: 0.92rem;
  color: rgba(255, 255, 255, 0.85);
  margin: 0;
  max-width: 22em;
}

.page-about .about-local-copy .btn {
  margin-top: 0.5rem;
}

/* ===== 05 数据与技术 ===== */
.page-about .about-tech {
  padding: 4rem 0 5rem;
  border-bottom: var(--about-line) solid var(--about-primary);
}

.page-about .about-tech-grid {
  display: grid;
  gap: 2.5rem;
  align-items: start;
}

.page-about .about-tech-copy > p {
  font-size: 0.98rem;
  color: var(--about-ink);
  margin: 0 0 1.8rem;
  max-width: 38em;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0;
  border-top: var(--about-line) solid var(--about-primary);
  border-left: var(--about-line) solid var(--about-primary);
}

.page-about .about-stat {
  background: var(--about-white);
  border-right: var(--about-line) solid var(--about-primary);
  border-bottom: var(--about-line) solid var(--about-primary);
  padding: 1.25rem 1rem;
  min-height: 100px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.page-about .about-stat-num {
  font-family: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
  font-size: clamp(1.5rem, 4vw, 2.4rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--about-primary);
  white-space: nowrap;
}

.page-about .about-stat-num span {
  color: var(--about-alt);
  margin-left: 0.1em;
}

.page-about .about-stat p {
  font-size: 0.8rem;
  color: var(--about-muted);
  margin: 0.5rem 0 0;
}

.page-about .about-tech-figure {
  margin: 0;
  background: var(--about-primary);
  border: var(--about-line) solid var(--about-primary);
  box-shadow: var(--about-shadow);
  position: relative;
}

.page-about .about-tech-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 3 / 2;
}

.page-about .about-tech-figure figcaption {
  position: absolute;
  left: 0.75rem;
  bottom: 0.75rem;
  background: var(--about-ink);
  color: var(--about-accent);
  font-family: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.35rem 0.6rem;
  border: 2px solid var(--about-accent);
}

/* ===== 跨页链接 ===== */
.page-about .about-crosslinks {
  padding: 4rem 0 5rem;
}

.page-about .about-crosslinks-grid {
  display: grid;
  gap: 1.25rem;
}

.page-about .about-crosslink {
  position: relative;
  display: block;
  background: var(--about-white);
  border: var(--about-line) solid var(--about-primary);
  box-shadow: var(--about-shadow);
  padding: 1.6rem;
  text-decoration: none;
  color: var(--about-ink);
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.page-about .about-crosslink:hover {
  transform: translate(-3px, -3px);
  box-shadow: 12px 12px 0 rgba(10, 37, 64, 0.15);
}

.page-about .about-crosslink-label {
  font-family: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--about-muted);
}

.page-about .about-crosslink h2 {
  font-family: "Noto Serif SC", "Songti SC", "SimSun", serif;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--about-primary);
  margin: 0.4rem 0 0.6rem;
}

.page-about .about-crosslink p {
  font-size: 0.9rem;
  color: var(--about-ink);
  margin: 0 0 2rem;
  max-width: 24em;
}

.page-about .about-crosslink-arrow {
  position: absolute;
  right: 1.2rem;
  bottom: 1rem;
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--about-accent);
  border: 2px solid var(--about-primary);
  background: var(--about-primary);
  line-height: 1;
  padding: 0.2rem 0.4rem;
  transition: transform 0.2s ease;
}

.page-about .about-crosslink:hover .about-crosslink-arrow {
  transform: translateX(6px);
}

.page-about .about-crosslink--accent {
  background: var(--about-primary);
  border-color: var(--about-primary);
}

.page-about .about-crosslink--accent .about-crosslink-label {
  color: var(--about-accent);
}

.page-about .about-crosslink--accent h2,
.page-about .about-crosslink--accent p {
  color: var(--about-white);
}

.page-about .about-crosslink--accent .about-crosslink-arrow {
  color: var(--about-primary);
  background: var(--about-accent);
  border-color: var(--about-accent);
}

/* ===== 滚动显现与错峰 ===== */
.page-about [data-reveal] {
  opacity: 1;
  transform: none;
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.page-about [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ===== 平板 ===== */
@media (min-width: 768px) {
  .page-about {
    --about-pad: 2rem;
  }

  .page-about .about-journey-main {
    grid-template-columns: 1.2fr 1fr;
    gap: 2rem;
  }

  .page-about .about-journey-facts {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .about-timeline {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.5rem;
  }

  .page-about .about-service-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
  }

  .page-about .about-local-grid {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 2.5rem;
  }

  .page-about .about-tech-grid {
    grid-template-columns: 1.1fr 1fr;
    gap: 3rem;
  }

  .page-about .about-stats {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .about-crosslinks-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
  }
}

/* ===== 桌面端 ===== */
@media (min-width: 1024px) {
  .page-about .about-manifesto-grid {
    grid-template-columns: repeat(12, 1fr);
    gap: 0 3rem;
  }

  .page-about .about-manifesto-lead {
    grid-column: 1 / 6;
  }

  .page-about .about-manifesto-body {
    grid-column: 7 / 13;
    padding-top: 0.5rem;
  }

  .page-about .about-toc {
    grid-column: 7 / 13;
    margin-top: 0;
  }

  .page-about .about-manifesto-num {
    top: auto;
    bottom: 0;
    right: 1rem;
  }

  .page-about .about-journey-head {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-bottom: 2.5rem;
  }

  .page-about .about-journey-head .about-section-head {
    margin-bottom: 0;
  }

  .page-about .about-journey-head::after {
    content: "成长档案 · 2018 至今";
    font-family: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--about-muted);
    padding-bottom: 0.5rem;
  }

  .page-about .about-timeline {
    grid-template-columns: repeat(5, minmax(240px, 1fr));
    grid-auto-flow: column;
    grid-auto-columns: minmax(240px, 1fr);
    overflow-x: auto;
    padding-bottom: 1rem;
    scroll-snap-type: x proximity;
    gap: 1.25rem;
  }

  .page-about .about-timeline-item {
    scroll-snap-align: start;
  }

  .page-about .about-service-grid {
    grid-template-columns: repeat(12, 1fr);
    gap: 1.5rem;
  }

  .page-about .about-service-card:first-child {
    grid-column: 1 / 5;
  }

  .page-about .about-service-figure {
    grid-column: 5 / 9;
    margin-top: 2.5rem;
  }

  .page-about .about-service-card--accent {
    grid-column: 9 / 13;
  }

  .page-about .about-service-card:last-child {
    grid-column: 3 / 9;
    margin-top: -1.5rem;
    position: relative;
    z-index: 2;
  }

  .page-about .about-local-grid {
    grid-template-columns: 7fr 5fr;
    gap: 4rem;
  }

  .page-about .about-local-panel {
    min-height: 380px;
  }

  .page-about .about-tech-grid {
    grid-template-columns: 6fr 5fr;
    gap: 4rem;
    align-items: center;
  }

  .page-about .about-stats {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .about-crosslinks-grid {
    gap: 2rem;
  }
}

/* ===== 宽屏 ===== */
@media (min-width: 1440px) {
  .page-about .about-manifesto-lead {
    grid-column: 1 / 5;
  }

  .page-about .about-manifesto-body {
    grid-column: 6 / 12;
  }

  .page-about .about-toc {
    grid-column: 6 / 12;
  }
}

/* ===== 减少动效 ===== */
@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal],
  .page-about .about-crosslink,
  .page-about .about-crosslink-arrow {
    transition: none;
  }

  .page-about .about-crosslink:hover {
    transform: none;
    box-shadow: var(--about-shadow);
  }

  .page-about .about-crosslink:hover .about-crosslink-arrow {
    transform: none;
  }
}